How It Works

How does SlimFast Work? It works in a way that is right for you!

For over 40 years, SlimFast has been helping millions of Americans take control of their diet, lose the weight and keep it off®. Now after 50 clinical studies, the SlimFast diet plan has been perfected to include more options than ever before.

Just replace any two meals with SlimFast shakes, bars or cookies, enjoy one sensible meal of your choice and three 100-calorie snacks in between. This way your metabolism stays burning, you never go hungry and you don’t miss out on your favorite foods. If you’re following the SlimFast Keto Plan, you’ll want to use the SlimFast Keto Quick-Start Guide to ensure you’re including the principles of the ketogenic diet. Get the guide here.

Don’t skip Sunday brunch with your friends or stay back when your coworkers head out for lunch together. Just make that meal your sensible meal of the day and have your shake, smoothie or bar for the other two. You’ll be amazed at how easy it is to plan meals when you have a daily routine that is easy to follow. The SlimFast diet plan lets you choose what to eat so you can always stick to it, no matter how unpredictable your days can get.

For maximum results, avoid sugar-sweetened beverages like juice and sodas. They will only slow down your weight loss and make you tired. Drink plenty of water, and get in 30 minutes of daily exercise instead. You’ll burn calories, gain lean muscle mass and release feel-good endorphins that will keep you smiling all the way to your goal weight.

You deserve 30 minutes of me-time every day. Make the time for a daily walk, or pick a fun new activity to try!

SlimFast has 50 published clinical studies designed and conducted by independent researchers. The research shows that The SlimFast® Plan is proven to help you lose weight fast and keep it off®. You can see results in just one week and lose 50% MORE weight than a reduced-calorie diet. Check out our clinical studies.

Does SlimFast Work For Men?

Men, don’t worry. We understand that you typically need a few more calories than women do. Adjusting the SlimFast diet plan for men is easy! All you have to do is add 200 calories to each SlimFast meal replacement. Use 2 scoops instead of 1 when you’re making a smoothie, eat 2 bars or cookies, or add a a mini-meal of your own. For recipe ideas, you can check our healthy meal options at slimfast.com/recipes.

How Do you Use SlimFast To Keep The Weight Off?

Once you hit your goal, you can start replacing one meal a day with a SlimFast shake, bar or cookie and eat two sensible meals of your choice every day. If you’re worried you’ll miss snacking in between meals, we’ve got your back. Our 100-calorie snacks will still be important to keep your metabolism burning, and your snack-game strong.

And don’t stop exercising! Thirty minutes a day gives you a much better chance of keeping the weight off, and a positive attitude that will brighten yours and everyone else’s day.

Now that you’ve mastered how to lose weight with SlimFast, what are you waiting for? We can’t wait to hear your success story!

* When used as part of the SlimFast Plan. Individual results may vary. Based on the SlimFast Plan (a calorie-reduced diet, and regular exercise, plenty of fluids). Check with your doctor if nursing, pregnant, under 18, following a doctor prescribed diet.